The Cat Ba langur (T. p. policephalus) is endemic to Cat Ba Island, the largest of more than 3,000 islands in Halong Bay off the northeastern coast of Vietnam (4). There is no evidence that this subspecies has ever lived on the mainland (3). The white-headed black langur (T. p. leucocephalus) is found in south China where it occupies seven karst regions in Guangxi Province. These regions are spread across three isolated, protected areas known as the Fusui Rare and Precious Animal Reserve, the Chongzuo Rare and Precious Animal Reserve, and the Longgang National Nature Reserve (5).
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